[ISL] Rendering depth maps

Post by **OnoSendai** » Fri Jul 03, 2009 4:56 pm

yes, use length(a - b).
pow() makes baby jesus cry.

Borgleader · Post by **Borgleader** » Fri Jul 03, 2009 5:03 pm

OnoSendai wrote:yes, use length(a - b).
pow() makes babies & jesus cry.

fixed

no but seriously this is interesting thread

following closely!

Post by **fused** » Fri Jul 03, 2009 5:57 pm

yeah, pow() was a bad choice

sqrt(), too!
i know i really should not use them in speed sensitive tasks...

length(a - b), aye, SIR!

lycium · Post by **lycium** » Fri Jul 03, 2009 6:48 pm

OnoSendai wrote:makes baby jesus cry.

Borgleader wrote:fixed

no you broke it

anyway, i'd be interested to know what the relative performance (to the massive rendering engine) is between the two versions... i suspect it'll be quite small?

Post by **fused** » Fri Jul 03, 2009 7:02 pm

im testing i right now. it does not seem to be much faster.... will make a comparison by rendering both for 10 minutes.

lycium · Post by **lycium** » Fri Jul 03, 2009 7:26 pm

especially 32bit vs 64bit (non-LLVM compiled) would be interesting

Post by **fused** » Fri Jul 03, 2009 7:38 pm

im on a mac atm, so no 32 vs 64 for now.

both images rendered for exactly 5 minutes. 114 spp for the lenght() and 102 for sqrt() and pow(), thats about 11% faster.

Post by **fused** » Fri Jul 03, 2009 9:41 pm

btw: using a black albedo material and an emitting material with black albedo one can also fake "object buffers" (thats what they are called in c4d). The visibility of an object to the camera as an alpha map.

Example:

: object buffer.jpg (36.48 KiB) Viewed 5770 times

pixie · Post by **pixie** » Fri Jul 03, 2009 10:45 pm

Poor fused, he has no money to buy indigo, please help him...

Post by **fused** » Fri Jul 03, 2009 10:59 pm

I have a license, but im at work

Post by **fused** » Sat Jul 04, 2009 12:44 am

experimenting woth postpro DOF and some color corrections with the 'object buffers'.
originally it was a 80% white rendering without dof

ZomB, i hope you dont mind me messing with your beautiful scene

: schrank.png (905.21 KiB) Viewed 5750 times

Zom-B · Post by **Zom-B** » Sat Jul 04, 2009 5:03 am

go for it and do what ever you like with this scene my friend

Take care about the depth map if you wan't to use it for PP bluring
since my camera settings generate dof blur.
The depth map rendering is still way to slow for such a feature :/
a 32 vs 64 test would be very interesting, just like lyc said...

Post by **fused** » Sat Jul 04, 2009 5:10 am

I set the f-stop to 64, that should kill all dof.

will do a 32/64 bit comparison when i get back to my 64 bit machine

eman7613 · Post by **eman7613** » Sat Jul 04, 2009 5:14 am

OnoSendai wrote:The 64 bit build will use the LLVM JITing backend, when LLVM supports 64 bit JITing without crashing and burning

LLVM jit seemts to work fine from ubuntu & debian repositories, that is odd. (granted i never done anything fancy with it) (im on 64bit)

Post by **OnoSendai** » Sat Jul 04, 2009 3:21 pm

Maybe it works on 64 bit Linux these days, but not Win 64.

[ISL] Rendering depth maps

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